Processes for the preparation of isocyanates
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[0071] A process according to an embodiment of the invention is explained in more detail with reference to FIG. 1. FIG. 1 is a representative flowchart depicting a process according to the invention for the preparation of TDI.
[0072] In a first stage 1 of the preparation of isocyanates, chlorine 11 is reacted with carbon monoxide 10 to give phosgene 13. In the following stage 2, phosgene 13 from stage 1 is reacted with an amine 14 (in this case toluenediamine) to give a mixture 15 of isocyanate (toluene-diisocyanate, TDI) and hydrogen chloride, the isocyanate 16 is separated off (in stage 3) and utilized. The HCl gas 17 is reacted with oxygen 18 in the HCl oxidation process 4.
[0073] For this e.g., a UV-transparent reaction tube can be used, this being charged with HCl and O2 in the stoichiometric ratio of 4:1. The reaction mixture is irradiated in the reaction tube with short wavelength (<250 nm), coherent UV light with the aid of a pulsed excimer laser. The temperature of the reac...
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